tolong kakk please, pake jalan ya
Rumus keliling lingkaran = 2πr atau πd
a) K = 2πr
K = 2 x 3,14 x 3
K = 18,84 cm
b) K = 2πr
K = 2 x 3,14 x 5
K = 31,4 cm
c) K = 2πr
K = 2 x 22/7 x 7 ((coret semua angka 7))
K = 2 x 22
K = 44 cm
d) K = πd
K = 22/7 x 21 ((coret angka 21 dan 7))
K = 22 x 3
K = 66 cm
e) K = πd
K = 22/7 x 28 ((coret angka 7 dan 8))
K = 22 x 4
K = 88 cm
note:
22/7 penulisannya :
[tex] \frac{22}{7} [/tex]
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